Railway-car truck.



Pzitented Aug; 14,1917? Y B m vY w .WIIIJM a P 3 w A m.

' H.. BURRMANN.

RAILWAY CAR TRUCK. APPLICATION flLED DEC. l5| l9l6- Patented Aug. 14, 1917.

3 SHEETS-SHEET 2.

HENRY BURRMANN, or nAvnirron'r owa.

RAILWAY-GAR TRUCK.

Specification 01 Letters Patent.. Patented Aug, 14, 1917.

Application filed December 15, 1916. Serial No. 137,109.

To all-whom ammo concern:

Be it known that I, HENRY BURnMnNN, a citizen of the United States of America, and a resident of Davenport, county of Scott, State of lowa, have invented certain new and useful Improvements in Railwaylar 'lrucks, of which the following is a full and clear specification.

In the railway cars new in common use, the car-body-bolster rests ri idly on the truckbolster and the ends 0' the truck bolster are slidingl y engaged in vertical slots in the truck side frames, springs being arranged n the side frames to give the necessary res1l- .iency and tie bars or other devices being arranged to connect the truck side frames. In this construction, the lateral thrusts clue to the tendency of the car body to more laterally on he trucks are transn'iitted directly to the side frames of the truck, thereby necessitating the-employment of heavy side frames and also the tie bars or other con nections above referred to. It is the main object of my present invention to relieve the side frames. of thetruclc greatly from these heavy tl'u'usts, so as to thereby make it pos sible to not only do away with the tiebars but also to reduce the weight of the side frames, as more fully hereinafter set forth.

A further object of. this invention is to provide the truck with-side bearings which will. autonmtically adjust themselves to the proper height in accordance with the load carried by the car and which also will cusl1- ,ion the thrustsof the car body when it tilts and tend to stabilize it, more fully hereinafter set forth.

In the drawings I Figure l a plan view of one side of a truck constructed in accordance with my invention;

Fig. 2 is a view.,of b ter partly in side elevation and partlyfii ertical section;

Fig. isa broken away perspective view of 2l:-.]')0ltl()ll of the truck-bolster body;

Figs. 4, 5. 6, 7, 8 and l) are detail views hereinafter described.

Referring to the d rawings annexed by reference characters, a designates abody bolster having secured to it a center plate having an annular bearing 1) which fits in an annular bearing channel in the center bearinn mounted on the truck bolster. lhe center plate of the'car bolster is provided with a pair of arouate lateral bearing; plates i] at its opposite sides, which are supported on a series or anti-friction rollers e mountbearing therein.

' engage ed in arcuate race-ways formed in the upper surface of the center bearing 0 outside of and concentric with the usual annular These supplemental outside bearings serve not only to reduce friction while the car is traveling on a curve, but also tend to prevent the car from tilting. It will be observed that the anti'friction rollers e' are readily arranged, so that eachroller will have no more than a line contact against the raceway surfaces, thus reducing the friction to a minimum in these supplemental bearings.

The center bearing 6 is centered by the usual king bolt f which extends down through the bolster a and. the two center bearing members and has its lower ends stepped in a recess {1 formed in the bottom of a pocket, this pocket being open at its upper side and being formed by the side walls of the truck bolster and transverse partition walls It, the bottom 2' of this pocket lying l'ireferably at a point above the bottom-side of the bolster.

The center bearing 0 of the truck bolster is supported entirely by a plurality of springs 7' inclosed within the pocket or well and resting on the bottom thereof, the center bearing: bein prevented from turning and being guidec in its vertical movements by a pair otdepending Walls or flanges which slidingly engage the outerfaces of the guide walls It in the bolster. With this construction it will be ()lJSGT'VQdtl'HHl any number and arrangement of coil springs may be arranged inthe pocket.

The ends of the truck bolster are rigidlycounected in any suitable way with the side frames Z oif the truck; I prefer making this rigid. connection by means of a notch m on the upper side of the side frame, the end of the bolster being adapted to fit this notch closely and to be placed therein from the top of the side frame. The bolster rests rigidly upon the bottom of the notch in the side frame, the under side of the-bolster being provided witlrtrmisverse flanges a which the opposite sides of the frame and. prevent all lateral nmvement of the bolster on the frame. With my resilient center bearing, it will be observed. that'the thrust, due to the tendency of the car body to move sidi-swise wliile running, will be hugely ta ken up by flanges 7:: of the center plate and the guide walls of the bolster /l thus relieving the side frames materially from side thrusts, thereby enabling inc notonly to make the the thrust blocks is a said flange is. connected pivotally to the sald ears I: by acap, and, in order that this block each other, one

the other convcxcd to fr.. rrn 111 effect a ball:

side frames lighter in weight, but also to do away with the usual tie rod between'the side side bearing blocks 0 Whose lower ends are approxin'iately wedge-shaped", to adapt them to fit against the correspondinglyinclined adjacent faces of thrust blocks p inclosed Within the bolster and'adapted to slide along a bearing g inclining downwardly and inwardly toward the center of the bolster. Integrally formed on the inner face of'cach of pair of ears 7' adapted to receive between them the longitudinally slotted end of the link 8 whose inner end is connected to the adjacent wall is of: the center bearing, the connection consisting of the pivot-I Whose axis is horizontally transverse with respect to the lt-olster and whose ends are supported in suitable flanges formed on The outer end of the link is transverse pivot 11., this pivot extending through a slot in the link and thus permitting a limited amount of lost motion between the thrust block and the link.v Mounted pivotally on the pin it is a cap n which embraces the outer end of a coil s ring 20 which sin-rounds the link 8 and has its inner end pressing,- through the medium of a rub plate 0:, against the adjacent face of. the transverse wall ?/"f()lll'le(l in. the bolster.

I The adjacent faces of the block 12' and the cap '0 are in contact so that the thrustwill be transmitted, to the spring thrrmgh the and capaction relatively to shall have a. pivotal.

of the parts is concaved and and-socket joint. a I, I i y Spring 10' being under tension, the cap 1f is pressed out 'ardly until the pin it rests in the outer end of the slot in the, link. The load on the center plate cruises the inner end of the spring 10 to move downwardly. the

' rub plate at sliding down on the outer face of ing.

the wall 3 This'action results'in drawing :dmvnwardly on its inclined su 'iport-and thus positions it properly for the mrticuhn: load the car iscarrylVhe'n the car body tilts in rounding a. curve or when overloaded on one side, pressure on the side bearing block '0 forces the same d1 )\\-'I 1\\'ardly and. thus 'cams or wedges. the thrust block inwardly, its movement being reacted by spring in. The slot- 111 which pin --u shdes'is large enough to prevent'putting rod 8 in compression in case an overload onjblock 0 should push block 79 to its limit inwardly. It will thus be observed that myiimproved side bearing devices not onl cushion the tilting move nally bear, and means operated by resilient means 'int-erpose a holster whose ends sin y that the relative positions of the axles and the truck bolster Will always be maintained. In this way, the two axles and the two side frames and the truck bolster form in effect a rigid truck. This thebrakehangers upon the truck bolster, where they will always maintain their proper relative positions with respect to the wheels. For this purpose, '1' mount the brake hanger brackets 0 upon the opposite sides of the truck bolster. I prefer casting the truck bolster in a. single piece, but it will he understood that it may be enables me to support as shown,

made in other ways-without departing from the spirit of my invention. When the truck bolster is thus made of a. casting, the brake hanger brackets is will be cast integral therewith.

. The nature and scope of the invention having been thus indicated and its preferred embochment having been specihcally described, what is claimed as new is:

l. A side bearing consisting of vertically movable side-beariiigbloclrs, thrust blocks in the holster against which'theside-hearing-blocl is northe load for positioning said thrust blocks, said n lcans ei'nbodying a resilienlly supported centerbearing for the car lrmly and also between the center bearing and said. thrr liS.

Inacar truck, a pa r side :l'rsuws, each having a. suitalilc noiurh in its. top side,

reel in notches depending projcclions on 111'. ster being provided for preventing); endwise movement of the bolster with respect to the side fran'ies, said projections engaging the OPPOSltB faces of the side frame along the bottom of the notch, a center bearing plate for supporting the car body and resilient -means for suppm'ting the corner bearing plate in the bolster, said bolster being provided with av pocket for the reception of said='resilient-means and said center hearing plate being n'o-vided with depemling fiancee guided vertically by coi'itact with portions signature.

ii-mum. Romanians.

movement independent of arrangement for trucks, 

